- Hardness Test Should Be Started From The Least hard Pencil.
- Start From Smaller Number Softer To Harder Pencil TO Leave Only ONE Scratch.
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CHEMICAL COMPOSITION Carbon and Silicates are chemically resistant Silicates are more durable Carbonates are less Durable and can reac... -
DURABILITY OF GEMS MATERIALS DURABILITY is combination of three parameters. HARDNESS: Resistance to Scratching TOUGHNESS: ...
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